Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate that this is a mutation (readOnlyHint=false), not destructive (destructiveHint=false), and idempotent (idempotentHint=true). The description adds no behavioral details beyond listing fields; it does not mention partial-update semantics, validation, or side effects. The term "completion" is ambiguous and does not correspond directly to a schema property.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single concise sentence and front-loaded with the action and resource. However, the inclusion of "completion" is slightly redundant/ambiguous, and could be omitted for clarity. Still, it is appropriately brief.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With an output schema, full parameter descriptions, and annotations, the tool is reasonably well specified. The description is minimal but sufficient for basic understanding. It lacks important operational context such as whether only provided fields are updated or if the request requires specific permissions, which matters for an update operation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the input schema fully documents each parameter. The description only repeats field names and adds no extra meaning. It does mention "completion" which is not a parameter and could confuse, but overall the schema carries the parameter semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a clear verb ("Update") and resource ("a task") and enumerates the updatable fields (status, priority, assignee, due date, completion). This unambiguously distinguishes it from sibling tools like create_task, get_task, delete_task, and list_tasks.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives, nor any prerequisites or exclusions. The tool name implies modification of existing tasks, but the description does not explicitly state this or contrast with create_task/delete_task.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.